Control knob



FIG. 1 is a front view of a control knob showing my new design;

FIG. 2 is a top-plan view of the first embodiment thereof, the right, left and bottom-plan views being identical;

FIG. 3 is a rear view thereof;

FIG. 4 is a top-plan view of a second embodiment of the control knob consisting of a different shaft design, the bottom-plan view being identical;

FIG. 5 is a right side view thereof, the left side view being identical; and,

FIG. 6 is a rear view thereof. 

I claim the ornamental design for a control knob, as shown and described. 